/*-
 * ============LICENSE_START=======================================================
 * ONAP - SO
 * ================================================================================
 * Copyright (C) 2019 Bell Canada
 * ================================================================================
 * Modifications Copyright (c) 2020 Nordix
 * ================================================================================
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * ============LICENSE_END=========================================================
 */

package org.onap.so.client.cds;

import org.camunda.bpm.engine.delegate.DelegateExecution;
import org.onap.so.bpmn.common.BuildingBlockExecution;
import org.onap.so.bpmn.servicedecomposition.entities.BuildingBlock;
import org.onap.so.bpmn.servicedecomposition.entities.ExecuteBuildingBlock;
import org.onap.so.bpmn.servicedecomposition.tasks.ExtractPojosForBB;
import org.onap.so.client.cds.beans.AbstractCDSPropertiesBean;
import org.onap.so.client.exception.PayloadGenerationException;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import java.util.UUID;

@Component
public class GeneratePayloadForCds {

    private static final String ORIGINATOR_ID = "SO";
    private static final String BUILDING_BLOCK = "buildingBlock";
    private static final String DEFAULT_SYNC_MODE = "sync";
    private static final String MSO_REQUEST_ID = "msoRequestId";

    @Autowired
    private VnfCDSRequestProvider vnfCDSRequestProvider;

    @Autowired
    private VfModuleCDSRequestProvider vfModuleCDSRequestProvider;

    @Autowired
    private ServiceCDSRequestProvider serviceCDSRequestProvider;

    @Autowired
    private ExtractPojosForBB extractPojosForBB;

    @Autowired
    private PnfCDSRequestProvider pnfCDSRequestProvider;

    /**
     * Build properties like (blueprint name, version, action etc..) along with the request payload for vnf, vf-module
     * and service.
     *
     * @param execution - A building block execution object.
     * @return AbstractCDSPropertiesBean - A POJO which contains CDS related information.
     * @throws PayloadGenerationException - Throw an exception if it fails to build payload for CDS.
     */
    public AbstractCDSPropertiesBean buildCdsPropertiesBean(BuildingBlockExecution execution)
            throws PayloadGenerationException {

        ExecuteBuildingBlock executeBuildingBlock = execution.getVariable(BUILDING_BLOCK);
        BuildingBlock buildingBlock = executeBuildingBlock.getBuildingBlock();
        final String requestId = execution.getGeneralBuildingBlock().getRequestContext().getMsoRequestId();
        final String scope = buildingBlock.getBpmnScope();
        final String action = buildingBlock.getBpmnAction();


        CDSRequestProvider requestProvider = getRequestProviderByScope(scope);
        requestProvider.setExecutionObject(execution);

        final String requestPayload = requestProvider.buildRequestPayload(action)
                .orElseThrow(() -> new PayloadGenerationException("Failed to build payload for CDS"));

        return prepareAndSetCdsPropertyBean(requestProvider, requestPayload, requestId, action, DEFAULT_SYNC_MODE);
    }

    /**
     * Build properties like (blueprint name, version, action etc..) along with the request payload for pnf.
     *
     * @param execution - A building block execution object.
     * @return AbstractCDSPropertiesBean - A POJO which contains CDS related information.
     * @throws PayloadGenerationException - Throw an exception if it fails to build payload for CDS.
     */
    public AbstractCDSPropertiesBean buildCdsPropertiesBean(DelegateExecution execution)
            throws PayloadGenerationException {

        final String scope = String.valueOf(execution.getVariable(PayloadConstants.SCOPE));
        final String action = String.valueOf(execution.getVariable(PayloadConstants.ACTION));
        final String requestId = String.valueOf(execution.getVariable(MSO_REQUEST_ID));
        final String mode = extractAndSetMode(execution);

        CDSRequestProvider requestProvider = getRequestProviderByScope(scope);
        requestProvider.setExecutionObject(execution);

        final String requestPayload = requestProvider.buildRequestPayload(action)
                .orElseThrow(() -> new PayloadGenerationException("Failed to build payload for CDS"));

        return prepareAndSetCdsPropertyBean(requestProvider, requestPayload, requestId, action, mode);
    }

    private AbstractCDSPropertiesBean prepareAndSetCdsPropertyBean(CDSRequestProvider requestProvider,
            String requestPayload, String requestId, String action, String mode) {
        final AbstractCDSPropertiesBean cdsPropertiesBean = new AbstractCDSPropertiesBean();
        cdsPropertiesBean.setRequestObject(requestPayload);
        cdsPropertiesBean.setBlueprintName(requestProvider.getBlueprintName());
        cdsPropertiesBean.setBlueprintVersion(requestProvider.getBlueprintVersion());
        cdsPropertiesBean.setRequestId(requestId);
        cdsPropertiesBean.setOriginatorId(ORIGINATOR_ID);
        cdsPropertiesBean.setSubRequestId(UUID.randomUUID().toString());
        cdsPropertiesBean.setActionName(action);
        cdsPropertiesBean.setMode(mode);
        return cdsPropertiesBean;
    }

    private String extractAndSetMode(DelegateExecution execution) {
        String mode = DEFAULT_SYNC_MODE;
        Object obj = execution.getVariable(PayloadConstants.MODE);
        if (obj != null && !String.valueOf(obj).isEmpty()) {
            mode = String.valueOf(obj);
        }
        return mode;
    }

    private CDSRequestProvider getRequestProviderByScope(String scope) throws PayloadGenerationException {
        CDSRequestProvider requestProvider;
        switch (scope) {
            case PayloadConstants.VNF_SCOPE:
                requestProvider = vnfCDSRequestProvider;
                break;
            case PayloadConstants.VF_MODULE_SCOPE:
                requestProvider = vfModuleCDSRequestProvider;
                break;
            case PayloadConstants.SERVICE_SCOPE:
                requestProvider = serviceCDSRequestProvider;
                break;
            case PayloadConstants.PNF_SCOPE:
                requestProvider = pnfCDSRequestProvider;
                break;
            default:
                throw new PayloadGenerationException("No scope defined with " + scope);
        }
        return requestProvider;
    }
}